feat: commit-level version tracking for same-release updates

Backend:
- constants.uc: add TACHYON_COMMIT_SHA constant (placeholder __COMPILED_COMMIT_SHA__)
- build.sh: capture git rev-parse HEAD and sed-replace commit SHA placeholder
- Makefile: same commit SHA sed replacement for OpenWrt builds
- action.uc: modify check_tachyon() to compare installed commit SHA with
  target_commitish from GitHub release, new status 'outdated_same_release'
- action.uc: reuse release_json for both version and commit SHA extraction
- updater.uc: add release_commit_sha helper to extract target_commitish
- updates.uc: extend cacheable status to include outdated_same_release

Frontend:
- main.js: handle outdated_same_release status in renderComponentCard
- main.js: include outdated_same_release in shouldShowInstallAfterCheck
- main.js: include outdated_same_release in applyCachedCheckResults

i18n:
- Add 'Update is available for current release' and 'Update is available
  for current release:' to .pot and .ru.po files

78 tests pass.

tachyon/files/usr/lib/components/updater.uc

@@ -271,6 +271,13 @@ function release_metadata_tsv() {
     print(tag, "\t", as_string(release.html_url || ""), "\n");
 }
 
+function release_commit_sha() {
+    let release = object_or_empty(read_stdin_json());
+    let sha = as_string(release.target_commitish || "");
+    if (sha != "")
+        print(sha, "\n");
+}
+
 function openwrt_release_value(path, key) {
     let data = fs.readfile(path);
     if (data == null)
@@ -1060,6 +1067,11 @@ function updates_check_result_row(component, current_version, latest_version, st
         return;
     }
 
+    if (status == "outdated_same_release") {
+        print("Update is available for current release\t", component, " update is available for current release: ", current_version, "\n");
+        return;
+    }
+
     if (status == "dev") {
         print("Installed version is newer than release\t", component, " installed version is newer than upstream release: ", current_version, " -> ", latest_version, "\n");
         return;
@@ -1216,6 +1228,8 @@ else if (mode == "tachyon-release-plan")
     tachyon_release_plan(ARGV[1], ARGV[2], ARGV[3]);
 else if (mode == "release-metadata-tsv")
     release_metadata_tsv();
+else if (mode == "release-commit-sha")
+    release_commit_sha();
 else if (mode == "openwrt-release-value")
     openwrt_release_value(ARGV[1], ARGV[2]);
 else if (mode == "openwrt-release-series")